Experts suggest people should keep an eagle eye open for notes featuring JA01 (as in Austen’s initials); JA75, as that is her birth year; and JA17, the year of the author’s death.

Website Changechecker.org says: “Whilst these will likely become popular with collectors in the future, it could be many years before notes with these serial numbers enter circulation due to the huge amount of possible combinations that would come before ‘JA’.”